Rape case haunts Buck in Colorado

"You told him how to get in. ... It would appear to me and it appears to others that you invited him over to have sex with him. Whether that you, at that time, were conscious enough to say yes or no?," he asked. "I'm telling you that's what the circumstances suggest, to people, including myself, who have looked at it."

Forseth said Buck's words show he seemed to be judging the woman rather than hearing her story.

But Buck's campaign called the newly released tape a nonstory pushed by a group out to destroy Republicans.

"Reputable news organizations should not be an echo chamber for Progress Now. We obviously can't trust them," said Buck spokesman Owen Loftus.

Loftus said Buck's view was backed up by the Boulder County district attorney. "They all came to the same conclusion that this was not a case they could move forward," he said.

Buck's campaign also notes that as a prosecutor, he started a multiagency sexual assault review team and sexual assault nurse examiner program to provide care to victims and collect evidence in criminal cases.